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Re: 402ci Oil Pressure Line Q
My truck originally had a 402 and now has a 454. Same difference regarding oil pressure line hookups.
The holes in your first picture are for coil mounting brackets (I believe). Because you have an HEI distributor with the coil built into the top of the cap you are not using those holes on your intake.
The hole in your second picture is just a regular hole for mounting brackets and stuff to the cylinder head.
The holes in the third picture are just another spot for mounting stuff to the cylinder head.
All of the holes in your three pictures do not connect to an oil gallery therefore would not suffice for connecting an oil pressure gauge.
The correct spot to mount that metal line would be right above the oil filter. The first link in your post shows the correct location to connect that line.
If the fitting on the metal line is too small you will need a brass adapter similar to the one in the picture.
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